JPS60132070A - Ignitor for internal-combustion engine - Google Patents

Abstract

PURPOSE:To always secure certain ignition state by installing a closed-angle control means for adjusting the conduction time rate of the primary winding and a constant-current control means for setting the max. conduction current value of the primary winding to a prescribed value. CONSTITUTION:A current breaker 15 cuts-off the conduction state of the primary winding 12A under opened state and allows the genration of a reverse electromotive force on an ignition coil 12. A closed-angle control circuit 16 controls the closing time for the current breaker 15 and adjusts the conduction time rate of the primary winding 12A. A constant-current control means constituted of a variable resistor 26 and a transistor 27 sets the max. conduction current value of the primary winding 12A in the operation state of a transistor 15 to a prescribed value. Therefore, a high secondary voltage and a long electric-discharge time can be secured for a spark plug, and a certain ignition state is always secured.

Description

[Detailed description of the invention] [Technical field] The present invention relates to an ignition device for an internal combustion engine.

[Background Art 1] Generally, in order to propagate flame in an internal combustion engine, ignition energy is intensively applied between the poles of the spark plug, a local exothermic reaction is caused by this, a flame kernel is formed, and this flame kernel is transferred to the spark plug. It is necessary to grow against the cooling effect of the electrodes and the air-fuel mixture flow, and therefore it is necessary to ensure a high secondary voltage and a long discharge time on the secondary side of the ignition coil.

On the other hand, there are two basic types of ignition devices: one that uses a current interruption method and one that uses a capacitor discharge method.

The ignition system using the current interruption method has a power supply and an ignition coil.
A current breaker is interposed in the closed circuit including the secondary winding, and the primary winding can be energized under the closed state of the current breaker, and the opening chamber of the current breaker synchronized with the ignition signal allows the primary winding to It is possible to generate a back electromotive force in the ignition coil by cutting off the energization state of the ignition coil.

In this current interrupt type ignition system, all of the energy accumulated in the ignition coil by the opening operation of the current breaker is consumed in the ignition plug, and in the low rotation range where the primary winding is energized for a long time, the ignition coil does not have enough energy. It is possible to store a large amount of energy and ensure a long discharge time.

An ignition device using a capacitor discharge method includes a capacitor that is connected to a power source in a chargeable manner and is also connected to a primary winding of an ignition coil through a switching element in a dischargeable manner, and switches in synchronization with an ignition signal. The element is made conductive. This capacitor type ignition system is
By selecting the inductance of the ignition coil and the capacitance of the capacitor, the resonant frequency of the resonant circuit formed by the ignition coil and the capacitor can be increased, and the rise of the current discharged from the capacitor to the primary winding can be made faster. to increase the current density, and this current causes a high
Although it is possible to secure the secondary voltage, it is difficult to secure a long discharge time.

Therefore, conventionally, as an ignition device that combines the above-mentioned current interruption method and capacitor discharge method, a power source and an ignition coil are combined.
It can be inserted into a closed circuit including the next winding, and 1
A current breaker that enables the secondary winding to be energized and generates a back electromotive force in the ignition coil by interrupting the energizing state of the primary winding in an open state, and is connectable to a power source for charging. , a capacitor that can be connected to the primary winding so as to be dischargeable via a switching element, and in synchronization with the ignition signal, opens the current breaker and makes the switching element conductive. An ignition device has been proposed.

According to this composite type ignition device, it is possible to secure a long discharge time based on the ignition operation using the current cutoff method in a low rotation range, and also to ensure a high secondary voltage based on the ignition operation using the capacitor discharge method.

However, in the case of the above conventionally proposed composite type ignition device, when the current breaker is closed,
In the low rotation range, where the energization time to the secondary winding is too long, power consumption efficiency is hindered; conversely, in the high rotation range, where the energization time to the primary winding is too short, the necessary and sufficient energy is transferred to the ignition coil. This can make it difficult for the spark plug to ignite reliably. Furthermore, since the magnitude of the current flowing through the primary winding changes with fluctuations in the power supply voltage, the amount of energy stored in the ignition coil becomes unstable due to fluctuations in the power supply voltage, causing the ignition to ignite. There is also a risk that the ignitability of the plug may become unstable.

[Object of the Invention] The present invention provides an ignition device that combines a current interrupting method and a capacitor discharge method.
It is possible to always store the necessary and sufficient energy in the primary winding without sacrificing power consumption efficiency, and the spark plug can be used efficiently and stably in the low load, low rotation range, or the entire high load, high rotation range. The purpose is to ensure a high secondary voltage and long discharge time, and to always obtain a reliable ignition state.

[Structure of the Invention] In order to achieve the above object, the present invention is capable of being installed in a closed circuit including a power source and a primary winding of an ignition coil, and is capable of energizing the primary winding in a closed state. , a current breaker that can interrupt the energization of the primary winding in an open state and generate a back electromotive force in the ignition coil; An ignition device for an internal combustion engine, which has a capacitor that can be connected to a primary winding so as to be dischargeable, and which opens a current breaker and brings a switching element into a conductive state in synchronization with an ignition signal, A closing angle control means that controls the closing time of the current breaker and makes it possible to adjust the energization time rate of the primary winding, and a predetermined maximum energizing current value of the primary winding under the closed state of the current breaker. and constant current control means for setting the current value.

[Detailed Description of the Invention] FIG. 1 is an electrical circuit diagram showing an applicable circuit of an ignition device 10 according to an embodiment of the present invention.

In the figure, 11 is a contact type or non-contact type ignition signal generator, and in this example, it is possible to generate an ignition signal by switching from an on state to an off state. 1
2 is an ignition coil, which has a primary winding 12A and a secondary winding 12
It consists of B. 13 is an ignition plug placed in the combustion chamber of the internal combustion engine, and the secondary winding 1 of the ignition coil 12
Connected to 2B.

The ignition device 10 can be inserted into a closed circuit including a power source 14 and a primary winding 12A of the ignition coil 12, and in a closed state, the ignition device 10
The secondary winding 12A can be energized, and the primary winding 12 is in an open state.
A closing angle control circuit 1 includes a transistor 15 as a current breaker that can interrupt the energization state of A and generate a back electromotive force in the ignition coil 12, and serves as a closing angle control means to be described later.
6 allows the transistor 15 to be switched from a closed state, that is, an active state, to an open state, that is, a cutoff state, in synchronization with the ignition signal generated by the ignition signal generator 11.

Further, the ignition device 10 is connectable to a DC-DC converter 17 which is connectable to a power source 14 in a chargeable manner, and a thyristor 1 as a switching element.
The thyristor drive circuit 20 applies a gate voltage to the thyristor 18 in synchronization with the ignition signal generated by the ignition signal generator 11. and thyristor 1
8 can be switched from a non-conductive state to a conductive state.

The thyristor drive circuit 20 includes a gate signal delay circuit that switches the thyristor 18 to a conductive state after the transistor 15 is switched to a cutoff state by the closing angle control circuit 16, and discharges when the thyristor 18 is in a conductive state. This eliminates the possibility that the high voltage on the main capacitor 19 acting on the still active transistor 15 would destroy it.

As described above, the ignition device 10 includes the closing angle control circuit 16 as described below. The closing angle control circuit 16 is
Constant current signal detection circuit 21. It consists of an integrating circuit 22, a waveform shaping circuit 23, a 3-angle wave generating circuit 24, and a closing angle determining circuit 25, and uses the waveform processing shown in FIGS. 2(A) to 2(H) to determine the previous ignition point and the next ignition point. Within the range of the ignition interval formed by the ignition interval, the proportion occupied by the closing time of the transistor 15, that is, the energization time rate (closing angle) of the primary winding 12A can be adjusted. Note that in FIGS. 2A to 2H, the horizontal axis represents time T, and the vertical axis represents voltage V.

That is, the constant current signal detection circuit 21 monitors the voltage change at a point A on the transistor 15 connection side of the primary winding 12A as shown in FIG. A constant current signal a shown in FIG. 2(B) which is generated when the maximum current value 1 cem is applied to the next winding 12A is detected.

Here, the voltage at the above point A is the voltage corresponding to the above a below the voltage of the power supply 14, 350 to 500 [V] indicated by b,
and C indicates 30 to 140 [V] (7) The discharge voltage is changed to the voltage of the power supply 14 indicated by d. Therefore,
The constant current signal detection circuit 21 exceeds 0 [■] and the power supply 14
As described above, a voltage signal below the voltage of a is converted into a constant current signal a
It is output to the integrating circuit 22 as . Next, integrating circuit 2
2 performs an integral process on the constant current signal a, and outputs a signal e shown in FIG. 2(C) to the closing angle determining circuit 25.

On the other hand, the waveform shaping circuit 23 shapes the ignition signal f as shown in FIG. 2(D) generated by the ignition signal generator 11, and converts the signal g shown in FIG. 2(E) into a triangular wave generating circuit. Output to 24. The triangular wave generating circuit 24 processes the signal g for two concave edges, and outputs the signal shown in FIG. 2(F) to the closing angle determining circuit 2.
Output to 5.

Therefore, as shown in FIG. 2 (G), the closing angle determining circuit 25 compares the voltage value of the signal e and the voltage value of the signal RI, and determines the state in which the voltage value of the signal RI is larger than the voltage value of the signal e. below, second
The closing angle control circuit 16 generates the closing angle signal i shown in FIG. energize. Here, if the energization time rate of the primary winding 12A is excessive compared to the standard state, a constant current control means to be described later is applied to the primary winding 12A.
The time during which the maximum current value is applied to A becomes longer,
Therefore, the voltage at point A, the signal a output by the constant current signal detection circuit 21, and the signal e output by the integrating circuit 22 are the second
Changes as shown by broken lines in figures (A), (B), and (C),
Since the voltage of the signal e becomes higher, the range in which the voltage value of the signal is larger than the voltage value of the signal e becomes shorter, and therefore, the generation time of the closing angle signal is shortened by Δt shown in FIG. 2 (H). Ru.

That is, in the closing angle control circuit 16, if the energization time rate of the primary winding 12A is excessive, the energization time rate is automatically shortened, and conversely, the energization time rate of the primary winding 12A is reduced. If is too small, the energization time rate is automatically extended, thereby making it possible to always ensure an optimum energization time rate. Therefore.

According to this ignition device 10, in the low rotation range, -1-
The ignition coil 12 is suppressed from unnecessary increase in the energization time rate.
This makes it possible to eliminate wasteful accumulation of energy and improve power consumption efficiency. Furthermore, by extending the energization time rate in the high rotation range, it is possible to accumulate necessary and sufficient energy in the ignition coil 12, and it is possible to ensure ignition in the ignition plug 13.

Further, as described above, the ignition device 10 is equipped with the following constant current control means. This constant current control means is composed of a variable resistor 26 and a transistor 27, and can set the maximum current value Icem of the primary winding 12A to a predetermined value when the transistor 15 is in an active state, and furthermore, -I- The setting value of the maximum current value 1cm is made variable. The variable resistor 26 has one end connected to the emitter of the transistor 15 and the other end grounded. The transistor 27 has its collector connected to the connection point B between the base of the transistor 15 and the closed angle control circuit 16, its emitter grounded, and its base connected to the connection point B between the emitter of the transistor 15 and the variable resistor 26. ing.

That is, in this ignition device 10, when the transistor 15 is in an active state, the current Ice flowing through the primary winding 12A is
However, the variable resistor 26 generates a voltage at the connection point □B between the emitter of the transistor 15 and the variable resistor 26.

When the current Ice increases and the voltage at point B reaches the base voltage Vbe0, which makes it possible to set the transistor 27 to the active state, the transistor 27
becomes active. When the transistor 27 becomes active, a part of the base current 1be supplied to the transistor 15 by the closing angle control circuit 16 is shunted to the collector current Ice0 for the collector of the transistor 27, thereby reducing the base current 1be. As the base current Ibe for transistor 15 decreases, transistor 15
Since the current amplification factor of transistor 15 is constant,
The increase in the current Ice is reduced, and the maximum value of the current Ice is automatically set to a constant value, that is, the maximum current value I
ces can be set.

Therefore, in this ignition device 10, the ignition coil 12
The primary resistance of the ignition coil 12 is reduced to speed up the rise of the current flowing through the primary winding 12A, and the increase in the current flowing through the primary winding 12A caused by reducing the primary resistance of the ignition coil 12 is reduced. By the action of the constant current control means, the maximum current value is suppressed to 1 cm or less, and the ignition coil 1
The rise of the primary current of the ignition coil 12 is accelerated without causing heat generation due to an excessive current in the ignition coil 2, and the necessary and sufficient energy can be stored in the ignition coil 12 even in a high rotation range. Moreover, according to this ignition device 10,
Even if the voltage of the power supply 14 decreases, the maximum current value Ic set by the constant current control means remains in the primary winding 12A.
Since the current is applied until e111 flows, the maximum current value of the primary winding 12A does not change even if the voltage of the power source 14 changes, and the amount of energy stored in the ignition coil 12 remains unchanged. No instability caused by voltage fluctuations.

Further, the maximum current value IceI11 is determined by the following equation (1), where R is the set resistance value of the variable resistor 26.

Here, if the base voltage Vbe0 required to activate the transistor 27 is constant, by adjusting the set resistance value R of the variable resistor 26, the maximum current value 1
It becomes possible to adjust cem to any value. This makes it possible to select the maximum energizing current value Icem to an optimum value according to the characteristics such as the inductance and primary resistance of the ignition coil 12 to which this ignition device 10 is connected. That is,
If constant current control means is applied to the three types of ignition coils A, B, and C as shown in FIG. 1- Because constant current control is applied immediately after starting,
The current flowing through the coil becomes smaller and the energy decreases, and for ignition coil C, even if the current flowing through the coil reaches the saturation current value, constant current control still does not work.
Too much current flows through the coil, causing it to heat up. On the other hand, corresponding to each characteristic of 1 ignition coil A, B, C,
The maximum current value is It, I2. If it is possible to switch settings for each of I3, it becomes possible to store energy that matches the characteristics of each ignition coil, and the ignition device 10 can be applied to various ignition coils without heating the coil.
It becomes possible to form.

Further, in the ignition device 10, a sub-capacitor 28 is connected to one end of the primary winding 12A to which the main capacitor 19 is connected, and the other end thereof. The main capacitor 19, the thyristor 18, the primary winding 12A, and the auxiliary capacitor 28 form a closed circuit. Note that the sub capacitor 28 is connected to the intermediate part of the connection circuit between the primary winding 12A and the power supply 14, and a diode 29 is connected to the power supply 14 side from the connection point of the sub capacitor 28 in the circuit. The interposed diode 29 allows current to flow from the power source 14 to the primary winding 12A and prevents current from flowing in the opposite direction, ensuring that the charge discharged from the main capacitor 19 flows into the sub capacitor 28. In addition, by forming a closed circuit, it is possible to reliably turn off the thyristor 18. Further, a diode 30 is connected in parallel to the thyristor 18, and the diode 30 allows current to flow from the primary winding 12A to the main capacitor 19, and can block current flow in the opposite direction.

That is, by providing the main capacitor 19 and the sub capacitor 28 at both ends of the primary winding 12A as described above, when the thyristor 18 becomes conductive, the electric charge stored in the main capacitor 19 passes through the primary winding 12A. When the voltages at points A and C at both ends of the primary winding 12A become equal, an oscillating center state of capacitor discharge is formed in which the primary current flow through the main capacitor 19 stops. The voltages Vl and V2 at points A and C at both ends of the primary winding 12A that form the vibration center state are the capacitances of the main capacitor 19 and the sub capacitor 28, C1 and C2.
, if the charges stored in each capacitor 19.28 after the thyristor 18 is turned on are Ql and Q2, the following equation (2) is obtained.

Vl = V2 = Q1/CI = Q2/C2 (2)
The electric charge Q accumulated in the main capacitor 19 by the output voltage (2) of the DC-DC converter 17 before the thyristor 18 becomes conductive is expressed by the following equation (3).

Q=Q1 +Q2 =C1 fist ■ ... (3) 6 According to the equations (2) and (3) in the second paragraph, the following equation (4) holds true.

That is, according to this ignition device 10, the main capacitor 1
By changing the ratio between the capacitance CI of 9 and the capacitance C2 of the sub capacitor 28, it is possible to set the vibration center of the capacitor discharge to an appropriate level. As a result, 1 is generated in the primary winding 12A due to discharge from the main capacitor 19
It becomes possible to suppress the polarity reversal of the next voltage oscillation. In addition, as mentioned above, the sub capacitor 2 is connected to the other end of the primary winding 12A.
8 is not provided, the vibration center of the capacitor discharge by the main capacitor 19 becomes the voltage level of the power supply 14, that is, the low level, and the characteristics of the primary voltage vibration are greatly reversed from the positive side to the negative side, and the ignition coil 12 The secondary voltage and secondary current generated on the next side will also be significantly reversed.

Next, the operation of the above embodiment will be explained.

While the ignition signal generator 11 does not generate an ignition signal, the transistor 15 is set to the active state by the closing angle control circuit 16, and the variable resistor 26 is connected to the primary winding 12A at the energization time rate determined by the closing angle control circuit 16. and transistor 27
The maximum current value Ice determined by the constant current control means consisting of
m is energized, and as described above, sufficient magnetic energy necessary for ignition operation is accumulated in the ignition coil 12 without impairing power consumption efficiency, and the thyristor drive circuit 20
As a result, the thyristor 18 is set to a non-conducting state, and the main capacitor 19 is charged.

Here, when the ignition signal generator 11 generates an ignition signal,
The transistor 15 is switched to the cut-off state via the closing angle control circuit 16, and a back electromotive force is generated in the ignition coil 12 in a direction that prevents the change in magnetic flux of the ignition coil 12, that is, from point A to point C.

Further, when the ignition signal generator 11 generates the ignition signal as described above, the thyristor 18 is switched to the conductive state by the thyristor drive circuit 20 at approximately the same time as the switching setting of the transistor 15, and the thyristor 18 is switched to the conductive state to prevent the discharge from the main capacitor 19. The accompanying primary current flows through the primary winding 12A, and the ignition coil 12
A secondary voltage is induced in the ignition coil 12 by mutual induction. The direction of the electromotive force generated on the secondary side by the primary current of the ignition coil 12 due to discharge from the main capacitor 19, and the direction of the back electromotive force generated on the secondary side of the ignition coil 12 due to the cutoff of the transistor 15. This makes it possible to obtain secondary voltage characteristics that rise quickly.

Here, the discharge from the main capacitor 19 flows into the auxiliary capacitor 28 through the primary winding 12A as described above, and when the voltages at points A and C at both ends of the primary winding 12A become equal, as described above, This is the oscillating center state of capacitor discharge. In the above embodiment, the capacitance C of the main capacitor 19
By adjusting the ratio between 1 and the capacitance C2 of the sub-capacitor 28, the center of vibration is set to an appropriate level on the in-phase side of the back electromotive force generated by the ignition coil 12 by cutting off the transistor 15. , as shown by the solid line waveform in FIG. indicates the vibration center level), therefore, it is also possible to suppress the rate at which the secondary voltage of the ignition coil 12 shifts to the opposite characteristic side, as shown by the solid line waveform in FIG. 4 and 5 show the back electromotive force generated in the ignition coil 12 due to the cutoff of the transistor 15 and the main capacitor 19.
The graph shows the total electromotive force generated in the ignition coil 12 by superimposing the electromotive force generated in the ignition coil 12 due to discharge from be.

Therefore, according to the above embodiment, since the composite type ignition device that combines the current interrupting method and the capacitor discharge method is equipped with the closing angle control means and the constant current control means, By the action of the closing angle control means, it is possible to reduce the 0 time rate of energization to the primary winding 12A, eliminate wasteful accumulation of energy in the ignition coil 12, and improve power consumption efficiency. In addition, in the high rotation range, by extending the energization time rate by the action of the closing angle control means, it is possible to store necessary and sufficient energy in the ignition coil 12,
Ignition at the spark plug 13 can be ensured. Further, by the action of the constant current control means, the excessive current flowing through the primary winding 12A is suppressed to below the maximum current value Icem, and the ignition coil 12 is prevented from generating heat due to the excessive current. The rise of the primary current of the ignition coil 12 is made quick, so that necessary and sufficient energy can be stored in the ignition coil 12 even in a high rotation range. Furthermore, even if voltage fluctuation occurs in the power supply 14 due to the action of the constant current control means,
The amount of energy stored in the ignition coil 12 can be stabilized.

Further, according to the above embodiment, the maximum current value Ices set by the constant current control means is adjusted to an optimal value according to the characteristics of the ignition coil 12 to which the ignition device 1O is connected,
The ignition device 10 can be easily applied to various ignition coils.

Further, according to the above embodiment, by connecting the main capacitor 19 and the sub capacitor 28 to both ends of the primary winding 12A, the polarity of the secondary voltage generated in the secondary winding 12B can be greatly swung to the opposite side. It is possible to prevent the current generated between the poles of the spark plug 13 from reversing during ignition, smooth the ignition operation, and improve power consumption efficiency by effectively consuming ignition energy. In addition, it becomes possible to stabilize and ensure the ignition operation.

Further, according to the above embodiment, by connecting the main capacitor 19 and the sub capacitor 28 to both ends of the primary winding 12A, the discharge from the main capacitor 19 causes
Transistor 1
5 makes it possible to bring it into phase with the back electromotive force generated in the primary winding 12A, so that the two do not cancel each other out, making it possible to improve power consumption efficiency.

Further, according to the above embodiment, by connecting the main capacitor 19 and the sub capacitor 28 to both ends of the primary winding 12A, the discharge from the main capacitor 19 causes
Transistor 1
Primary winding due to the cut-off action of step 5! ! It is possible to make it in phase with the back electromotive force generated at 12A, and the main capacitor 19
There is no need to ground a portion of the discharge from the transistor 15 to protect the transistor 15, and it is possible to improve power consumption efficiency.

Note that in the above embodiment, the transistor 1 is used as a current breaker.
5 has been described, however, a thyristor or the like may be used as the current breaker.

Further, in the above embodiment, as the closing angle control means, a constant current signal detection circuit 21, an integrating circuit 22, a waveform shaping circuit 23.3
Although the case has been described in which the closing angle control circuit 16 consisting of the angular wave generation circuit 24 and the closing angle determining circuit 25 is used, other three configurations may be used as the closing angle control means.

Further, in the above embodiment, the variable resistor 2 is used as the constant current control means.
6. Although the case of using the transistor 27 has been described, other structures may be used as the constant current control means.

Further, in the above embodiment, a case has been described in which the maximum energizing current value ■ceI11 in constant current control is made variable by adjusting the resistance value of the variable resistor 26, but the maximum energizing current value Ices may be made variable by other configurations. It may be something.

[Effects of the Invention] As described above, the present invention can be installed in a closed circuit including a power supply and the primary winding of an ignition coil, and can be energized to the primary winding in the closed state, and can be installed in the closed circuit including the primary winding of the ignition coil. A current breaker is provided at the bottom to cut off the energization state of the primary winding and generate a back electromotive force in the ignition coil, and a current breaker that can be connected to a power source in a chargeable manner and connects the primary winding to the primary winding via a switching element. It has a capacitor that can be connected to the line so that it can be discharged, and in synchronization with the ignition signal,
Open the current breaker and turn the switch 4. In an ignition system for an internal combustion engine that makes a ignition element conductive,
Closing angle control means for controlling the closing time of the current breaker and making it possible to adjust the energization time rate of the primary winding, and a maximum energizing current value of the primary winding under the closed state of the current breaker to a predetermined value. and constant current control means for setting. Therefore, in an ignition system that combines a current interrupt method and a capacitor discharge method, it is possible to always store the necessary and sufficient energy in the primary winding without sacrificing power consumption efficiency when the current interrupter is closed. , it is possible to efficiently and stably ensure high secondary voltage and long discharge time for the spark plug in the low load, low rotation range, or the entire high load and high rotation range, and to always obtain a reliable ignition state. It becomes possible.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing an applied circuit of an ignition device according to an embodiment of the present invention, Figs. 2 (A) to (H) are waveform diagrams showing closed angle control states in the ignition device, and Fig. 3 4 is a waveform diagram showing the primary voltage waveform in the ignition device, and FIG. 5 is a waveform chart showing the secondary voltage waveform in the ignition device. 10... Ignition device, 11... Ignition signal generator, 12
...Ignition coil, 12A...Primary winding, 12B...
・Secondary winding, 13... Spark plug, 14... Power supply,
15... Transistor (current breaker), 16... Closing angle control circuit, 18... Thyristor (switching element), 19... Main capacitor, 26... Variable resistor,
27...Transistor, 28...Sub-capacitor. Agent Patent Attorney Osamu Shiokawa Figure 2 Figure 3 ■ Figure 4 1 ■ Figure 5 J7c:

Claims (1)

[Claims] (1) It can be installed in a closed circuit that includes the power supply and the primary winding of the ignition coil, allowing the primary winding to be energized in the closed state, and cutting off the power to the primary winding in the open state. a current breaker capable of generating a back electromotive force in the ignition coil; and a capacitor connectable to a power source in a chargeable manner and connected to the primary winding via a switching element in a dischargeable manner. In an ignition device for an internal combustion engine, which opens a current breaker and makes a switching element conductive in synchronization with an ignition signal, the closing time of the current breaker is controlled, and the primary winding The circuit breaker is characterized by comprising a closing angle control means for adjusting the energization time rate of the circuit breaker, and a constant current control means for setting the maximum energization current value of the primary winding to a predetermined value when the current breaker is in the closed state. Ignition system for internal combustion engines.